I think you are referring to the cousin of one of the individual by the name Vaqas or something, not Salman.
His cousin was on a show and stated that last valentine's day this person was using the most foul language about the Prophet ,s.a.w. If this happened a year ago and these individuals were roaming about & going about their blogging then indeed the law failed.
Same thing happened and we saw the unfortunate consequences for S. Taseer. FYI, he used to say a lot more . way lot more to be precise & not very different from this bunch .
There is no such thing as absolute freedom!
If law keeps failing in this matter... people will keep taking matters in their own hands....